New phpstan find some questionable null fallback occurences, that are
not obvious. Add a baseline for now.

> composer req --dev phpstan/phpstan:^1.10.51
> ./Build/Scripts/runTests.sh -s phpstanGenerateBaseline

Resolves: #102756
Releases: main, 12.4
Change-Id: I3eef057d4fd04fe92f813bad7e1873718f6da765
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82352


Reviewed-by: Thomas Hohn <tho@gyldendal.dk>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Thomas Hohn <tho@gyldendal.dk>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>